You got it ,
wrap the 1911 in saran wrap , then run the holster under your hot warm water tap and fill the pocket and wet the flap,
let it set a few moments and allow it to drain off.
Insert the gun and allow to set over night , I like to kind of work the holster over the gun some ( wet Form )
Pull the gun out and give it a going over with light oil , let the holster dry a day or two.
Try the fit , if its to your liking , give the holster a rub of * leather conditioner* ...Restores the leather oils washed out with warm water.
* I'm partial to Skidmore's *